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IDE warm-plug HOWTO
To warm-plug devices on a port 'idex'::
# echo -n "1" > /sys/class/ide_port/idex/delete_devices
unplug old device(s) and plug new device(s)::
# echo -n "1" > /sys/class/ide_port/idex/scan
NOTE: please make sure that partitions are unmounted and that there are
no other active references to devices before doing "delete_devices" step,
also do not attempt "scan" step on devices currently in use -- otherwise
results may be unpredictable and lead to data loss if you're unlucky